Long-term projections indicate an expected demand of at least 100 scientific and 80 graphing calculators each day. Because of limitations on production capacity, no more than 200 scientific and 170 graphing calculators can be made daily.

where y is the average time per unit for . a is the time for the first unit . x is the cumulative number of units . b is the learning coefficient . Suppose, a = 10 hours, and the learning rate is 20% (i.e., when the cumulative quantity doubles, y is reduced by 20%). Calculate (a) The average time for 20 units,

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